Get a Slot 1 440BX board. With an unlocked PII 233 you can underclock it for speed-critical DOS games, while on the other side you can go up to PIII 1000 without any adapters.

d1stortion wrote:

Get a Slot 1 440BX board. With an unlocked PII 233 you can underclock it for speed-critical DOS games, while on the other side you can go up to PIII 1000 without any adapters.

I don't think underclocking should be necessary (unless there's something speed-critical that works with a 233 MHz Pentium MMX?), since I have a slower machine for that stuff. I just want something that would give me the highest compatibility.

Here's the hardware in the machine, just to give you a better idea of what I'm working with:
200 W PSU (I'm thinking this might be a problem for upgrades)
256 MB RAM
Nvidia Riva TNT
3dfx Voodoo 2
Aztech Sound Galaxy Washington 16 with NEC XR385 daughterboard
Sound Blaster 16 (see this thread for the reason for this)

d1stortion wrote:

Get a Slot 1 440BX board. With an unlocked PII 233 you can underclock it for speed-critical DOS games, while on the other side you can go up to PIII 1000 without any adapters.

You won't be able to use a PIII 1000 on every 440BX motherboard, since not every motherboard can supply the required voltages (Klamaths used 2.8V, Deshutess and Katmais ~2.0V and Coppermines ~1.7V) - many early 440BX have voltage regulators which don't support 1.7V.

That is why I wrote "up to". Katmai should work in most boards and is already enough to play Unreal nicely. Most likely better than any K6.

Early boards aren't worth messing around with for other reasons anyway. Some of them have iffy AGP voltage regulators. May or may not matter depending on video card choice of course...

I guess I'll look for a Slot 1 board then. Are there any particular specifications or features for which I should keep an eye out?

If you don't care about lower CPU speeds you can also just go S370, as I think that fast Coppermines are easier to find for that platform than for Slot 1.